﻿using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace FBGraph.Core.Tests
{
    /// <summary>
    /// Summary description for ExtendedPermissionTests
    /// </summary>
    [TestClass]
    public class ExtendedPermissionTests
    {
        public ExtendedPermissionTests()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        private TestContext testContextInstance;

        /// <summary>
        ///Gets or sets the test context which provides
        ///information about and functionality for the current test run.
        ///</summary>
        public TestContext TestContext
        {
            get
            {
                return testContextInstance;
            }
            set
            {
                testContextInstance = value;
            }
        }

        #region Additional test attributes
        //
        // You can use the following additional attributes as you write your tests:
        //
        // Use ClassInitialize to run code before running the first test in the class
        // [ClassInitialize()]
        // public static void MyClassInitialize(TestContext testContext) { }
        //
        // Use ClassCleanup to run code after all tests in a class have run
        // [ClassCleanup()]
        // public static void MyClassCleanup() { }
        //
        // Use TestInitialize to run code before running each test 
        // [TestInitialize()]
        // public void MyTestInitialize() { }
        //
        // Use TestCleanup to run code after each test has run
        // [TestCleanup()]
        // public void MyTestCleanup() { }
        //
        #endregion

        [TestMethod]
        public void ValuesAreUnique()
        {
            var names = Enum.GetNames(typeof(ExtendedPermission));

            var byValue =
                from name in names
                select new KeyValuePair<String, ExtendedPermission>(name, (ExtendedPermission)Enum.Parse(typeof(ExtendedPermission), name)) into namedValue
                group namedValue by namedValue.Value;

            var byName =
                from name in names
                select new KeyValuePair<String, ExtendedPermission>(name, (ExtendedPermission)Enum.Parse(typeof(ExtendedPermission), name)) into namedValue
                group namedValue by namedValue.Key;

            Assert.IsTrue(byValue.All(nv => nv.Count() == 1), "Duplicated value: {0}", GetDuplicateKeys(byValue));
            Assert.IsTrue(byName.All(nv => nv.Count() == 1), "Duplicate name: {0}", GetDuplicateKeys(byName));
        }

        private String GetDuplicateKeys(IEnumerable<IGrouping<String, KeyValuePair<String, ExtendedPermission>>> col)
        {
            var dupeGroup = col.FirstOrDefault(v => v.Count() > 1);
            if (dupeGroup == null) return String.Empty;
            else
            {
                var dupeNames = dupeGroup.Select(d => d.Key);
                return String.Join(", ", dupeNames.ToArray());
            }
        }

        private String GetDuplicateKeys(IEnumerable<IGrouping<ExtendedPermission, KeyValuePair<String, ExtendedPermission>>> col)
        {
            var dupeGroup = col.FirstOrDefault(v => v.Count() > 1);
            if (dupeGroup == null) return String.Empty;
            else
            {
                var dupeNames = dupeGroup.Select(d => d.Key);
                return String.Join(", ", dupeNames.ToArray());
            }
        }
    }
}
